Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.776633
Title: Tracer studies on the solid state : self-diffusion in aromatic solids
Author: White, David James
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1966
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Abstract:
Naphthalene and Anthracene were purified and single crystals of the materials grown by the Bridgmann-Stockbarger method. Self-diffusion coefficients were measured by tracer-sectioning technique in pure and doped single crystals of naphthalene, in polycrystalline naphthalene, and In monocrystalline of anthracene. Additional measurements on monocrystals of napthalene were made by a surface-decrease method. From the variation of diffusion coefficient with temperature the activation energies of diffusion and the Arrhenius pre-exponential factors were calculated. Self-diffusion in both naphthalene and andthracene was fond to be an extrinsic process, the diffusion coefficient at a particular temperature decreasing with increasing perfection of the crystal. Annealing was found to reduce the diffusion coefficient, D, varied with absolute temperature, T, according to the Arrhenius relationship D = D0 exp (E/RT), where E is the activation energy for diffusion, D the pre-exponential or frequency factor, and R 'the Ideal Gas constant. For annealed single crystals of naphthalene E was found to be 34,9kcal. per mole, and D0 2.5x10.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.776633  DOI: Not available
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